Your argument is that office is not on Linux because the user base is too small and not worth the support burden. The parents argument is that Linux's user bas

Your argument is that office is not on Linux because the user base is too small and not worth the support burden. The parents argument is that Linux's user base is smaller because critical applications like office are not available there. These arguments are not mutually exclusive. Microsoft would rather keep it's dominate windows market share _and_ have less support burden. On the other hand, Steam making Linux work well is a massive support burden for a smaller user base, but it prevented os vendor lock in for their platform. Decisions to release or not release software is not so easily distilled to single metrics such as support burden.